Attachment for printing presses



Spit., 6, 11949. D. DONNELL 2,481,090

ATTACHMENT FOR PRINTING PRESSES Filed Aug. 27, 1947 1N V EN TOR. @on /crd @enne/7 147 for/Q eyJ Patented Sept. 6, 1949 UNITED sTATEs PATENT OFFICE ATTACHMENT FOR PRINTING PRESSES Don R. Donnell, Los Angeles, Calif. Application August 27. 1947, Serial No. 770,815

4 Claims.

This invention relates generally to 'an improved printing press 'attachment and more particularly to the provision of means which can be readily incorporated into the usual platen printing press and use of which will enable the ready cutting and perforating of paper and printed material in a very simple manner.

A primary object ofthe invention is to provide a sturdy perforating or cutting rule for use with a platen press'which is of simple construction, may be easily installed and which will not interfere with the operation of the inking rollers and will furthermore prevent damage to the rollers.

A second object of the invention is to provide a perforating or cutting means which will be easily removable from the perforated surface upon completion of the perforating oper-ation.

Yet a further object of the invention is to provide perforating means for printing presses or the like which may be easily adjusted transversely and which furthermore is provided with means for angular adjustment with respect to the platen.

Other and -further important objects Iof this invention will ybe apparent from the disclosures in the accompanying drawings and the following specification.

The invention, in a preferred form, is shown in the drawings and hereinafter more fully described.

In the drawing:

Figure 1 is an elevation of the improved eprinting press attachment of this invention, showing the same as associated with the platen.

Figure 2 is an enlarged view of the perforating rule showing more clearly the Idetails of its construction.

Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 2.

Figure 4 is a sectional view taken on the line 4 4 of Figure 2 indicating more clearly the structural relationship between the perforating rule, its base plate, and the gripper bar.

Figure 5 is a view, partially in section, taken on the line 5--5 of Figure 2 showing details of construction of the perfor-ating blade with respect to the rule.

Figure 6 is a :plan view showing the first step of the method of Operation.

Figure '7 is a similar view showing the next step in the method of operation.

Figure 8 is a further plan view showing the third step in the method of operation.

Figure 9 is a cross-sectional showing taken on the line 9-9 of Figure 8.

As shown in the drawing:

Lit)

Referring speci-cally to Fig-ure 1 the numeral I I indicates generally the platen of a printing press to which is connected the normal type of gripper bar I3. The gripper bar I3 for the :purposes of this invention is modiiled to provide a longitudinal slot I5 and a longitudinal indentation I 1 extending across its lowermost edge.

The perforating or cutting bar indicated generally by the numeral I9 has a cut-down portion at its lower extremity which is adapted for insertion in a recess 23 of the ibase plate 25. An yordinary bolt 21 is adapted for insertion in a hole 29 in the base plate 25 and extends through the longitudinal slot I5 of the gripper bar I3. The hole 29 overlaps the recess 23 in the base plate and a matched indentation 3I is provided in the cut-down portion 2I-Yof the perforating rule whereby insertion of the bolt 21 will prevent longitudinal slipping of the perforating rule I9 with respect to the base plate 25, this in addition to maintaining the gripper bar I3, the base plate 25, and the perforating rule I 9 in xed relationship. It will be seen that when the bolt 21 is loosened the perforating rule I9 may be adjusted :transversely to any desired position. Angular adjustment may also be obtained when the bolt 21 is loosened by the turning of screws 33 and which are mounted at the lower extremity of the base plate 25 and whose heads engage the longitudinal indented portion I1 of the gripper bar I3.

The perforating blade 31 is held stationary in the longitudinal slot 39 of the perforating rule I 9 by application of small holding screws 4I. 'I'he slot 39 engages the blade 31 snugly at its lower eX- tremity, but flares outwardly at its open end as is clearly illustrated in Figure 3.

Referring specically to Figures 6, '1, and 8, the method of operation consists of the placement of parallel strips 43 of adhesive material upon the tympan paper 45 mounted on the platen I I. Thereafter the next step consists in the positioning of two adjacent pieces 41 of string, cord, or wire 'between adhesive strips 43, the adjacent pieces then being held in such applied position by small pieces of adhesive 49. The third step comprises the positioning of a strip 5I of zinc, lead, or other soft metal upon the juxtaposed pieces `of cord 41 and the subsequent fastening of same in some suitable manner.

The positioning of the cord 41 and piece of metal 5I will be such on the platen II that the descending blade 31 of the perforating rule I9 will encounter the tympan paper 45 between the two pieces of cord 41. The blade 31 will have no difficulty in piercing the piece of soft metal 5I, but after the perforation of the paper on the tympan 45, the metal will tend by spring action to force the blade away from the perforated material and therefore not disturb its position on the tympan 45. 4The shape assumed by the piece of metal 5l is demonstrated clearly in Figure 9 and the above-described action will be made obvious by this showing, .It wil-l further be understood that the joined vaction ofthe adjacent pieces of cord 41 With the flared portion of the blade slot 39 will tend to stretch the material to be perGv forated immediately prior to the perforating action whereby such action will be vifa-eilitat'ed. Although the paper will receive positive perforations, the projection of the cutting blade 31 will be insufiicient to injure the heavy tympan paper 45.

I am aware that many other changes suggested by my invention may be made and wide variations obtained without--depatingfrom the Lspirit of my invention and "I fdo not TWishtlri-erefore to be limited to *the particu-lar disclosures herein-de' scribed, 'fbut give reier-enoe to the appended claims.

I claim:

1. AV printing press attachment comprising a perforating gripper, a base plate removably mounted on the gripper bar -ofl the press and rigidifly connected to said perforating gripper, means ror-angular-adjustment for saidbase plate with respect -to the gripper Ehar `Aof the press longitudinal slots'in saidperfcratin'g gripper, a cooperative perforatin'g element fon theplaten 'of the press, and means fior transverse adjustment o'i the base vplate on said gripper '-'barx l2. A pr'inting press attachment comprising a perfor-ating gripper, a pase plate removably mounted on the gripper bar of the press and rigidly connected to said perorating gripper, and means for angular adjustment of said base plate with respect to the gripper bar of the press, said means comprising two screws mounted in said base plate whose heads contact the gripper bar of the press, longitudinal slots in said perforating gripper, a cooperative perforating element on the platen of the press, said element comprising two juxtaposed lengths 'of Lcord aligned with said longitudinal slots and a strip of soft metal superimposed on the cords.

3. A printing press attachment comprising a perforatin'g 'gripper mounted on the gripper bar Y of the press, longitudinal slots on said perforating gripper on each side of the blade thereof, and a cooperative perforating element on the platen of the press.

4. A printing press attachment comprising a perforating gripper mounted on the gripper bar df the press, longitudinal vslots lon Asaid perforating gripper en each-si'defof the made 'thereo and a cooperative perforatingelement on the platten o'f lthe press, said element comprising Itwo Yjuxtaposed lengths of cord aligned with saidV longitudinal slots andas/trip 'of soft meta-l sillperirnu posed on said cords.

' DON R. yDONNELL.

REFERENCES CITED The following references 'are Jof record in the le of this patent:

UNITED STATES PA'EFENTS Number Name Date 5055623 Chauncey Sept, '26, 1893 1,560,622 Tepper Nov. 410, 1925 2508"!,51'8 nruh June 2'2, '19'37 

